| 摘要 |
<p>A switched mode power supply circuit for a video display apparatus having run and standby modes of operation. A run mode power supply (T1, Q1) provides an output voltage (Vn3, Vn4) for the video display apparatus during the run mode of operation. A standby mode power supply (T2, Q51) provides an output voltage for the video display apparatus during the standby mode of operation. A switched mode power supply controller circuit (20) provides drive pulses (30) to the run mode power supply (T1, Q1) during the run mode and to the standby mode power supply (T2, Q51) during the standby mode. A snubber circuit (60) of the standby power supply is used to turn off a start-up transistor during the standby mode of operation to prevent power dissipation in a start-up resistor.</p> |
